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Achillea

Achillea millefolium (Common Yarrow)

Inflorescence	Inflorescence	Foliage

Ageratina

Ageratina altissima (Eupatorium rugosum) (White Snakeroot)

Flowering	Fruiting	Foliage	Leaf

Ambrosia

Ambrosia artemisiifolia (Ragweed)

Leaf	Infl	Staminate Head	Pistillate Head
Staminate Heads		Staminate Flowers	Pistillate Flowers

Antennaria

Antennaria neglecta (Field Pussytoes)

Inflorescence	Base	Specimen

Antennaria plantaginifolia (Plantain-Pussytoes)

Plant	Foliage
Leaves	Heads	Head

Anthemis

Anthemis cotula (Mayweed, Dogfennel)

		Living material photographed on West First Street Pier in Oswego
Flowering Head			Plant
Foliage	Specimen		Flowering Heads

Arctium

Actrium minus (Common Burdock)

Foliage	Head	Heads
"Burrs"	Head	Plant

Artemisia

Artemisia vulgaris (Mugwort)

Plant	Foliage	Leaves	Inflorescence Branch	Flower Heads

Bidens

Bidens cernua (Bur-Marigold)

Flower Head	Flower Head	Flower Head	Sessile Leaves

Bidens discoidea (Few-bracted Beggar-ticks)

Flower Heads	Young Fruits	Close Up

Bidens frondosa (Devil's Beggar-ticks)

Foliage	Leaf	Head	Head
Bract, Young Fruit		Fruits	Fruiting

Bidens tripartita (B. comosa) (Strawstem Beggar-ticks)

Foliage		Foliage	Petiole	Fruiting
Head	Head	Plant	Plant	Fruiting
Flower		Bract, Young Fruit	Flowers	Fruits

Centaurea

Centaurea jacea (Knapweed)

Flower Head	Flower Head	Fruiting	Lower Leaves	Upper Leaves

Cichorium

Cichorium intybus (Chicory)

Flower Head	Involucre	Stalk	Basal Leaves	Plants

Cirsium

Cirsium arvense (Canada Thistle)

Inflorescence	Inflorescences	Foliage

Cirsium vulgare (Bull Thistle)

Leaf	Stem	Head	Fruiting Head	Fruiting Head

Conyza

Conyza canadensis (Horseweed)

Flower Heads	Fruits	Branch	Plant

Erechtites

Erechtites hieraciifolius (E. hieraciifolia) (Fireweed)

Flower Heads	Fruiting	Close Up
Head	Fruits	Plant

Erigeron

Erigeron annuus (Daisy Fleabane)

Flower Head	Sectioned	Stem
Flower Head	Leaf	Plants

Erigeron philadelphicus (Common Fleabane)

Flowering Heads	Flowering Heads	Leaf	Plants

Erigeron strigosus (Rough Fleabane)

Inflorescence	Specimen

Eupatorium

Eupatorium perfoliatum (Boneset)

Flowering	Fruiting	Foliage

Eurybia (Aster in part)

Eurybia divaricata (Aster divaricatus) (White Wood Aster)

Flower Heads	Inflorescence	Fruiting
Colony	Foliage	Plants

Eurybia macrophylla (Aster macrophyllus) (Bigleaf Aster)

Foliage	Leaf	Flowering	Flower Head

Euthamia

Euthamia graminifolia (Flat-Top Goldenrod)

Flower Heads	Foliage	Plant	Rhizome

Eutrochium (Eupatorium in part)

Eutrochium maculatum (Eupatorium maculatum) (Spotted Joe-Pye-Weed)

Flowering	Fruiting	Foliage	Plants

Gnaphalium

Gnaphalium uliginosum (Low Cudweed)

Inflorescence	Flowering Heads	Specimen

Hypochaeris

Hypochaeris radicata (Long-Rooted Cat's Ear)

Heads	Open Head	Fruiting Head
Basal Leaves	Involucre	Fruits

Lactuca

Lactuca biennis (Tall Blue Lettuce)

Flowering Heads		Fruiting
Flowering	Foliage	Fruits

Lactuca canadensis (Canada Lettuce)

Foliage	Fruits	Flower Heads	Inflorescence

Lapsana

Lapsana communis (Nipplewort)

Flower Heads	Flower Head	Fruiting	Foliage	Plant

Leucanthemum

Leucanthemum vulgare (Ox-Eye Daisy)

Flower Head	Foliage

Matricaria

Matricaria discoidea (Pineapple-Weed)

Flower Head	Plant

Mikania

Mikania scandens (Climbing Boneset)

Inflorescence	Inflorescence	Foliage	Fruiting

Picris

Picris hieracioides (Ox Tongue)

Bud	Flower Head	Fruits	Plants
Opening	Flower Head	Foliage

Pilosella

Pilosella aurantiaca (Hieracium aurantiacum) (Devil's Paint-Brush)

Flower Heads	Foliage	Plant

Pilosella caespitosa (Hieracium caespitosum) (King Devil)

Involucre	Inflorescence
Head	Lower	Upper

Pilosella piloselloides (Hiereacium piloselloides) (King-Devil)

Inflorescence	Heads	Basal Leaves

Prenanthes

Prenanthes altissima (Rattlesnake Root)

Flowering Head	Plant	Spring Foliage

Rudbeckia

Rudbeckia fulgida (Coneflower)

Involucre	Styles	Bracts	Leaves	Foliage
Flower Head	Mature Disk	Foliage		Population

Rudbeckia hirta (Black-Eyed Susan)

Flowering Head	Flowering Head	Basal Leaves	Basal Leaf
Sectioned	Styles	Stem Leaf

Rudbeckia triloba (Three-Lobed Coneflower)

Flower Head	From Below	Plant	Foliage

Solidago

Solidago altissima (S. canadensis) (Tall Goldenrod)

Plants	Stem	Stem Galls
Flowering	Fruiting	Compare S. rugosa

Solidago caesia (Blue-Stem Goldenrod)

Plants	Plants	Inflorescence	Inflorescence	Flower Heads

Solidago juncea (Early Goldenrod)

Specimen

Solidago nemoralis (Gray Goldenrod)

Plant	Foliage	Flowers

Solidago rugosa (Tall Hairy Goldenrod)

Foliage	Stem	Inflorescence
Plants		Flower Heads	Compare S. altissima

Sonchus

Sonchus asper (Spiny-Leafed Sow Thistle)

Leaves	Flowering Head	Fruiting Head	Fruits
Lower Leaves	Leaf and Stem	Upper Leaf

Symphyotrichum (Aster in part)

Symphyotrichum cordifolium (Aster cordifolius) (Blue Heart-Leaved Aster)

Flower Heads	Inflorescence	Foliage

Symphyotrichum pilosum (Aster pilosus) (White Old-Field Aster)

Flower Head	Involucre	Flowers	Branch

Symphyotrichum lanceolatum (Aster lanceolatus var. simplex) (Tall White Aster)

Flower Heads	Involucres	Flowers	Foliage
Flower Heads	Disk Flower	Foliage	Midvein, ventral

Symphyotrichum lateriflorum (Aster lateriflorus) (Calico Aster)

Inflorescence	Close Up	Flowers	Inflorescence Branch
Flowers	Branch	Flower Heads	Midvein, ventral

Comparison of Symphyotrichum lanceolatum and S. lateriflorum

Disk Flowers S. lanceolatum (yellow) S. lateriflorum(purple - can be yellow)		Mid vein: S. lanceolatum (glabrous) S. lateriflorum (pubescent)

Symphyotrichum novae-angliae (Aster novae-angliae) (New England Aster)

Flowering Head	Fruiting Head	Fruits	Inflorescence	Foliage	Plant

Symphyotrichum puniceum (Aster puniceus) (Purple-Stem Aster)

Flower Heads	Flower Head	Fruiting Head	Fruits	Leaves	Foliage

Taraxacum

Taraxacum officinale (Common Dandelion)

Plant	Opening Head	Open Head	Fruiting

Tragopogon

Tragopogon pratensis (Goat's Beard)

Flower Head	Foliage	Fruits

Tussilago

Tussilago farfara (Colt's Foot)

Flowering	Flower Heads	Flower Head	Plants	Colony
Fruiting	Fruiting Head	Fruits	Young Leaf	Mature Leaves	Plants

Xanthium

Xanthium strumarium (Rough Cocklebur)

Inflorescence	Flower Heads	Leaf